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CVE-2019-20908

Status Candidate

Overview

An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.

Related Files

Red Hat Security Advisory 2020-3228-01
Posted Jul 30, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-3228-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include a bypass vulnerability.

tags | advisory, kernel, bypass
systems | linux, redhat
advisories | CVE-2019-20908, CVE-2020-15780
SHA-256 | 0f914ecf8ce36cbd69aeff46ac8fd3f7041f40e629e2e62024136c5296b14fdf
Red Hat Security Advisory 2020-3222-01
Posted Jul 30, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-3222-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include buffer overflow, bypass, denial of service, and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2019-19807, CVE-2019-20908, CVE-2020-10757, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-12653, CVE-2020-12654, CVE-2020-12888, CVE-2020-15780
SHA-256 | 7aa836b0e3a02a3fdd2ce96dcc6a7c3a433395ad7ca4206c09f9f8ca74a94cd4
Red Hat Security Advisory 2020-3219-01
Posted Jul 30, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-3219-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include a bypass vulnerability.

tags | advisory, kernel, bypass
systems | linux, redhat
advisories | CVE-2019-20908, CVE-2020-15780
SHA-256 | 1627eadaab9713c08474e83b37d1ae1cacd14576c47989e5a139a58512f3ed1a
Red Hat Security Advisory 2020-3218-01
Posted Jul 30, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-3218-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include a bypass vulnerability.

tags | advisory, kernel, bypass
systems | linux, redhat
advisories | CVE-2019-20908, CVE-2020-15780
SHA-256 | 781209adb64b9fdfd3531ac239587a48ffe64dfe0b18666338bdf00c5b3eba1c
Ubuntu Security Notice USN-4440-1
Posted Jul 28, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4440-1 - It was discovered that the network block device implementation in the Linux kernel did not properly check for error conditions in some situations. An attacker could possibly use this to cause a denial of service. It was discovered that the kernel->user space relay implementation in the Linux kernel did not properly check return values in some situations. A local attacker could possibly use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-16089, CVE-2019-19462, CVE-2019-20810, CVE-2019-20908, CVE-2020-10732, CVE-2020-10757, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-11935, CVE-2020-13974, CVE-2020-15780
SHA-256 | 93050dd9768e16bf8e7459dcfcb358a4a7847e519f51bfbd8b25246f475d27e4
Ubuntu Security Notice USN-4439-1
Posted Jul 28, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4439-1 - It was discovered that the network block device implementation in the Linux kernel did not properly check for error conditions in some situations. An attacker could possibly use this to cause a denial of service. It was discovered that the btrfs file system implementation in the Linux kernel did not properly validate file system metadata in some situations. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2019-12380, CVE-2019-16089, CVE-2019-19036, CVE-2019-19462, CVE-2019-20810, CVE-2019-20908, CVE-2020-10732, CVE-2020-10757, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-11935, CVE-2020-13974, CVE-2020-15780
SHA-256 | 789e8f002f0de81a8d353f1ea8d5a4ecb5aa606f09d0d78851c94acd0cbcd044
Ubuntu Security Notice USN-4427-1
Posted Jul 22, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4427-1 - It was discovered that the Kvaser CAN/USB driver in the Linux kernel did not properly initialize memory in certain situations. A local attacker could possibly use this to expose sensitive information. Chuhong Yuan discovered that go7007 USB audio device driver in the Linux kernel did not properly deallocate memory in some failure conditions. A physically proximate attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-12380, CVE-2019-19947, CVE-2019-20810, CVE-2019-20908, CVE-2020-10732, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-11935, CVE-2020-13974
SHA-256 | b977bb1eef5006f04c02310b64f67dfc0df0cf66bdb9c9980f831579b1b67812
Ubuntu Security Notice USN-4426-1
Posted Jul 22, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4426-1 - Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading SSDT code from an EFI variable. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. Fan Yang discovered that the mremap implementation in the Linux kernel did not properly handle DAX Huge Pages. A local attacker with access to DAX storage could use this to gain administrative privileges. Various other issues were also addressed.

tags | advisory, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-20908, CVE-2020-10757, CVE-2020-11935, CVE-2020-15780
SHA-256 | c08d99828ab0121536e6f7fbfa804274851e82d4f947dc4c837c3f5da9f63b08
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